/// <summary>
/// Checks if the time zone has equivalent transitions in the time range.
/// This method returns true when all of transition times, from/to standard
/// offsets and DST savings used by this time zone match the other in the
/// time range.
/// </summary>
///
/// <param name="tz">The instance of <c>TimeZone</c></param>
/// <param name="start">The start time of the evaluated time range (inclusive)</param>
/// <param name="end">The end time of the evaluated time range (inclusive)</param>
/// <param name="ignoreDstAmount">When true, any transitions with only daylight saving amountchanges will be ignored, except either of them is zero. Forexample, a transition from rawoffset 3:00/dstsavings 1:00 torawoffset 2:00/dstsavings 2:00 is excluded from thecomparison, but a transtion from rawoffset 2:00/dstsavings1:00 to rawoffset 3:00/dstsavings 0:00 is included.</param>
/// <returns>true if the other time zone has the equivalent transitions in the
/// time range. When tz is not a <c>BasicTimeZone</c>, this
/// method returns false.</returns>
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public bool HasEquivalentTransitions(TimeZone tz, long start, long end,
bool ignoreDstAmount)
{
if (HasSameRules(tz))
{
return(true);
}
if (!(tz is BasicTimeZone))
{
return(false);
}
// Check the offsets at the start time
int[] offsets1 = new int[2];
int[] offsets2 = new int[2];
GetOffset(start, false, offsets1);
tz.GetOffset(start, false, offsets2);
if (ignoreDstAmount)
{
if ((offsets1[0] + offsets1[1] != offsets2[0] + offsets2[1]) ||
(offsets1[1] != 0 && offsets2[1] == 0) ||
(offsets1[1] == 0 && offsets2[1] != 0))
{
return(false);
}
}
else
{
if (offsets1[0] != offsets2[0] || offsets1[1] != offsets2[1])
{
return(false);
}
}
// Check transitions in the range
long time = start;
while (true)
{
TimeZoneTransition tr1 = GetNextTransition(time, false);
TimeZoneTransition tr2 = ((BasicTimeZone)tz).GetNextTransition(
time, false);
if (ignoreDstAmount)
{
// Skip a transition which only differ the amount of DST savings
if (tr1 != null &&
(tr1.GetFrom().GetRawOffset()
+ tr1.GetFrom().GetDSTSavings() == tr1.GetTo()
.GetRawOffset() + tr1.GetTo().GetDSTSavings()) &&
(tr1.GetFrom().GetDSTSavings() != 0 && tr1.GetTo()
.GetDSTSavings() != 0))
{
tr1 = GetNextTransition(tr1.GetTime(), false);
}
if (tr2 != null &&
(tr2.GetFrom().GetRawOffset()
+ tr2.GetFrom().GetDSTSavings() == tr2.GetTo()
.GetRawOffset() + tr2.GetTo().GetDSTSavings()) &&
(tr2.GetFrom().GetDSTSavings() != 0 && tr2.GetTo()
.GetDSTSavings() != 0))
{
tr2 = GetNextTransition(tr2.GetTime(), false);
}
}
bool inRange1 = false;
bool inRange2 = false;
if (tr1 != null)
{
if (tr1.GetTime() <= end)
{
inRange1 = true;
}
}
if (tr2 != null)
{
if (tr2.GetTime() <= end)
{
inRange2 = true;
}
}
if (!inRange1 && !inRange2)
{
// No more transition in the range
break;
}
if (!inRange1 || !inRange2)
{
return(false);
}
if (tr1.GetTime() != tr2.GetTime())
{
return(false);
}
if (ignoreDstAmount)
{
if (tr1.GetTo().GetRawOffset() + tr1.GetTo().GetDSTSavings() != tr2
.GetTo().GetRawOffset() + tr2.GetTo().GetDSTSavings() ||
tr1.GetTo().GetDSTSavings() != 0 &&
tr2.GetTo().GetDSTSavings() == 0 ||
tr1.GetTo().GetDSTSavings() == 0 &&
tr2.GetTo().GetDSTSavings() != 0)
{
return(false);
}
}
else
{
if (tr1.GetTo().GetRawOffset() != tr2.GetTo().GetRawOffset() ||
tr1.GetTo().GetDSTSavings() != tr2.GetTo()
.GetDSTSavings())
{
return(false);
}
}
time = tr1.GetTime();
}
return(true);
}
/// <summary>
/// TimeZone API; calls through to wrapped time zone.
/// </summary>
///
public override int GetOffset(int era, int year, int month, int day, int dayOfWeek,
int millis)
{
return(zone.GetOffset(era, year, month, day, dayOfWeek, millis));
}
